FP cavity and FBG cascaded optical fiber temperature and pressure sensor

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2019,（4）
• 页码范围: 39-43
• 页数: 5页
• 语种: 英文
• DOI: 10.3788/COL201917.040603

摘要

A fiber Bragg grating (FBG) and Fabry-Perot (FP) cavity cascaded fiber sensing system was manufactured for temperature and pressure sensing.Temperature sensing as high as 175℃ was performed by an FBG for the linear variation of an FBG wavelength with temperature.After the temperature was sensed,the demodulation system can find the original FP cavity length and its pressure and cavity length correlation coefficient;thus,the ambient pressure would be calculated.The sensing pressure can be as high as 100 MPa with a repeatability of 1/10,000 and high stability.This kind of fiber sensor has been used in the Shengli Oil Field.